Twin rotor high efficiency crusher



Nov. 26, 1968 w. J. SACKETT, SR 3,

TWIN ROTOR HIGH EFFICIENCY CRUSHER 2 Sheets-Sheet 1 Filed Oct. El. 1966INVENTOR WALTER J. SAC/(E77; 57?.

ATTORNEY Nov. 26, 1968 w. J. SACKETT, SR 3,412,945

TWIN ROTOR HIGH EFFICIENCY CRUSHER Filed Oct. 21. 1966 2 Sheets-Sheet 2Mia FIG. Z.

E I i 55 j:

FIG. 3.

I E25 P333 k g \m 4 22 I mvsu'roa WALTER J. SAG/(Err, SR.

ATTORNEY United States Patent O 3,412,945 TWIN ROTOR HIGH EFFICIENCYCRUSHER Walter J. Sackett, Sr., 3700 Echodale Ave., Baltimore, Md. 21206Filed Oct. 21, 1966, Ser. No. 588,502 8 Claims. (Cl. 241154) ABSTRACT OFTHE DISCLOSURE A materials crusher is described in which a pair ofoppositely rotatable elements are arranged in an enclosure. One of therotatable elements is in the form of a squirrel cage of parallel bars.The other rotatable element consists of a plurality of lengths of linkchain attached to the cross rods of a smaller cage.

A feed port is arranged in the top of the housing proximate the squirrelcage. Material dropped thereon is impelled against the flailing chains.The resulting powder falls out of the open bottom.

This invention relates generally to comminuting devices and moreparticularly to a twin rotor high efiiciency crusher for hard lumpmaterials.

In process work particularly, hard lumps are formed which ordinarycrushing methods do not effectively handle. Other mills fail to reducethese lumps to a fine enough powder for feeding back to process.

It is, therefore, an object of this invention to provide an improvedtwin rotor high efiiciency crusher for pulverizing lumps down to afinely divided state.

Another object of this invention is to provide a feed system in a twinrotor high eificiency crusher or the like which receives, acceleratesand then tangentially discharges the finely powdered material thuscrushed.

Yet another object of this invention is to provide an oppositely movingarrangement in a comminuting crusher whereby a greatly increased flyingimpact is obtained between lumps of material and a breaker element.

Still another object of this invention is to provide a more efficient,longer lived and quieter operating lump crusher than heretofore.

Still another object of this invention is to provide a crusher which isself-cleaning due to the flying impact of material being cast from onerotor to another.

Other objects and attendant advantages of this invention will becomemore readily apparent and understood from the following detailedspecification and accompanying drawings in which:

FIG. 1 is a vertical section taken on the longitudinal centerline of animproved twin rotor high efficiency crusher;

FIG. 2 is a transverse section showing details of the chain rotor takenon line 2-2 of FIG. 1; and

FIG. 3 is a transverse section showing details of the cage rotor takenon line 3-3 of FIG. 1.

Referring now to the drawings, particularly FIG. 1, reference numeralindicates generally a twin rotor high efiiciency crusher. This improvedcrusher 10 consists of a hollow sheet metal housing split on ahorizontal line into an upper portion 12 and a lower portion 14. The topof upper portion 12 is somewhat pitched at the ends and has a flangedaperture for an inlet chute 16.

The lower portion 14 of the mill 10 is rectangular and serves as asupport structure for a chain rotor 18 and a cage rotor 20. The bottomor lower portion 14 of mill 10 is open to provide an outlet 22.

Angular bearing block supports 26 are secured to the two opposingsupport side walls 24 of the lower portion 14 and are strengthened withgussets 28.

Patented Nov. 26, 1968 The chain rotor 18, as best shown in FIG. 2, isprovided with a drive shaft 30 which is journaled on hearing blocks 32secured upon supports 26. Three apertured discs 34 are mounted upon theshaft 30 and are spaced apart and secured for rotation by bosses 36.

An even plurality of equally spaced rods 38 extend through the threeapertured discs 34 and are secured by nuts 40. These rods 38 carryalternate banks 42 and 44 of four and three chains, respectively. Thechains 46 of these banks 42 and 44 are mounted by one end link andspaced on the rods 38 by spacers 48 so as to be free to fly outwardly bycentrifugal force when the chain rotor 18 rotates rapidly as shown bythe curved arrow in FIG. 1.

The cage rotor 20 rotates in the opposite direction as shown by theother curved arrow of FIG. 1. For this purpose, a drive shaft 50, asshown in FIGS. 1 and 3, is mounted on another pair of bearing blocks 32and the cage rotor 20 consists of two circular end plates 52 spaced andsecured for rotation by shaft bosses 54. A drum-like array of spacedbars 56 extend between the end plates 52 and are welded thereto.

In operation, with both rotors 18 and 20 rapidly rotating, the lumpymaterial is introduced into the mill 10 through inlet chute 16 to fallupon the cage rotor 20. Some of the lumpy material falls through theapertures between the bars 56 and is discharged from outlet 22. Theremaining portions of the material are thrown violently at a tan- 'genttoward the flailing sweeping chain banks 42 and 44 to be broken up andreduced by the blows to a powder which then falls through outlet 22.

There is no contacting of metallic parts in this mill 10 with consequentlittle wear and with relatively quiet operation.

Obviously many modifications and variations of the present invention arepossible in light of the above teachings. It is, therefore, to beunderstood that within the scope of the appended claims the inventionmay be practiced otherwise than as specifically described.

What is claimed is:

1. A twin rotor high efficiency crusher for breaking up lumpy materialsinto powder, comprising a housing having an upper portion and a lowerportion, said upper portion being substantially pitched at the ends andhaving an aperture for an inlet chute for receiving lumpy materials tobe broken up into powder, said lower portion having a cage rotor meansand a chain rotor means spaced from each other for reducing the size ofmaterials fed consecutively thereto, with said lower portion having anoutlet.

2. A twin rotor high efficiency crusher as recited in claim 1, whereinsaid chain rotor means and said cage rotor means are parallel spaced andin juxtaposition with respect to each other.

3. A twin rotor high efficiency crusher as recited in claim 1, whereinsaid chain rotor means includes a plurality of apertured discs havingequally spaced rods extending through said discs, with said rodscarrying alternate banks of chains.

4. A twin rotor high efliciency crusher as recited in claim 1, andadditionally means for driving said chain rotor means and said cagerotor means.

5. A twin rotor high efiiciency crusher as recited in claim 1, whereinsaid cage rotor means and said chain rotor means operate in oppositedirections so that said materials are substantially fed therebetween.

6. A twin rotor high efficiency crusher as recited in claim 1, whereinsaid cage rotor means includes a drumlike array of spaced bars extendingbetween end plates.

7. A twin rotor high efiiciency crusher as recited in claim 6, whereinthe introduced material falls upon cage rotor means, with a portion ofthe lumpy material falling through said bars, and with the remainingportion of the material being thrown violently at a tangent toward saidchain rotor means to be broken up and reduced by blows to a powder.

8. A twin rotor high efiiciency crusher as recited in claim 7, where thecrusher is self-cleaning due to the flying impact of material being castfrom one rotor to another.

4 References Cited UNITED STATES PATENTS 304,506 9/1884 Davids 241187 X1,433,042 10/1922 Sedberry 241-154 X 3,327,955 6/1967 Tyler a- 24l187WILLIAM W. DYER, JR, Primary Examine r.

F. T. YOST, Assistant Examiner.

